bill
Have never owned a lever 45-70, but have owned a 45-70. Great caliber, but if I were in your shoes, I'd get the Savage in 308 or as mentioned, 30-06. Both great calibers. My new 11FL in 223 is so very accurate.
Took it to the range once, and had three different loads (read three DIFFERENT BULLET WEIGHTS) through it. Put all three in the same places and bigget group was 1 1/8" and some were 3/4". I think the rifle is capable of far more, but don't have time to find the "perfect" load as yet.
The accutrigger takes getting used to cause you think the rifle isn't cocked cause the first part of the trigger moves so freely. Once you get used to it, it is one sweet trigger.
The guide gun is great if you never go over 150yds, the caliber has killing potential well beyond that, but you MUST know the trajectory or a miss is very likely. That range can easily be doubled with either of the other two without any hold over, if zeroed properly.
Remember military snipers still mostly use the .308 and a 10X scope for some shots that exceed 1,000yds.